Does anyone know what effect of effects Flabba Holt uses on his bass? During some passages his sound gets a bit nasal-y and other times his bass seems to burp and gurgle. It's almost like a subtle, touch-sensitive envelope filter. "The Voodoo Curse" from Scientist Rids The World of The Evil Curse of The Vampires is a perfect example of what I'm talking about. The sound is all over that album and on every other Roots Radics dub albums I've heard.